CN100457951C - High-nitrogen nickel-free bidirectional stainless steel alloy material and manufacture method thereof - Google Patents
High-nitrogen nickel-free bidirectional stainless steel alloy material and manufacture method thereof Download PDFInfo
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- CN100457951C CN100457951C CNB2006101163571A CN200610116357A CN100457951C CN 100457951 C CN100457951 C CN 100457951C CN B2006101163571 A CNB2006101163571 A CN B2006101163571A CN 200610116357 A CN200610116357 A CN 200610116357A CN 100457951 C CN100457951 C CN 100457951C
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Abstract
The invention discloses a high-nitrogen nickel-free ultra-double-phase stainless steel alloy material and preparing method in the steel alloy material preparing technological domain, which comprises the following parts: 0-0.03% C,24-26% Cr,14-20% Mn,2.0-4.0% Mo,0.30-0.55% N,0.05-0.2% Re (Ce or Y),not more than1.0%Si, not more than 0.01%S ,not more than 0.02%P,not more than 0.015%Ca,not more than 0.01%B and Fe.
Description
Technical field
The present invention relates to a kind of high-nitrogen nickel-free super-duplex stainless steel that contains rare earth metal and contain gold copper-base alloy and preparation method thereof, belong to steel and alloy material preparation process technical field.
Background technology
Duplex stainless steel is made up of austenite and ferrite, the existing nearly 80 years history of its development.Earlier 1960s, electric furnace has been produced Ultralow Carbon Stainless Steel, thereby has solved the intergranular corrosion problem of first-generation duplex stainless steel.Mutually stainless main component is chromium, nickel, molybdenum, and wherein nickel is the most expensive, in order to reduce cost, reduces the content of nickel in the steel, can adopt the content that increases manganese and nitrogen.The reduction of nickel content can reduce the influence of prices of raw and semifnished materials fluctuation to stainless steel market.Therefore, phase earlier 1970s, along with the development of AOD, VOD refinery practice, especially can control the adding of nitrogen in the AOD stove, thereby the exploitation that has promoted s-generation nitrogen bearing duplex stainless steel is as 2205 (its nitrogen content is about 0.15%).The adding of nitrogen has not only improved the local corrosion performance of steel, and has solved the stainless steel Welding Problems, makes duplex stainless steel become a kind of welding structured material, has widened the range of application of duplex stainless steel greatly.Simultaneously, molybdenum and chromium constituent content height in the dual phase steel, thereby have good anti-local corrosion ability.Because dual phase steel doubles than austenitic steel intensity, the use dual phase steel can weight reduction simultaneously.Some developed countries have used dual phase steel as excellent girder construction and coastland building iron at present.The latter stage fraction of the year of to 12nd century 80, the reduction with cost of further developing along with metallurgical technology, the adding of nitrogen can accurately be controlled, low nickel high-nitrogen super duplex stainless steel of the third generation such as UN32750 appear, its nitrogen content is about 0.25～0.35%, nickel content is 6～8%, but does not contain rare earth metal.In recent years, because the metallic nickel price further rapidly goes up, in order to reduce cost, the researchist has done many research work in this respect, has proposed low nickel or has not had the two-phase stainless composition of steel of nickel.
Summary of the invention
The high-nitrogen nickel-free super-duplex stainless steel alloy materials that the object of the present invention is to provide a kind of low cost and have good solidity to corrosion and hot workability.
A kind of high-nitrogen nickel-free super-duplex stainless steel alloy materials that contains rare earth metal of the present invention is characterized in that the composition of this stainless steel alloy material and weight percent thereof are:
Cr 24～26％，
Mn 14～20％，
Mo 2.0～4.0％，
N 0.30～0.55％，
C 0.01～0.03％，
Rare-Earth Ce or Y 0.05～0.2%,
Si ≤ 1.0％，
S ≤ 0.01％，，
P ≤ 0.02％，
0＜B≤ 0.01％，
The Fe surplus.
A kind of preparation method who contains the high-nitrogen nickel-free super-duplex stainless steel alloy materials of rare earth metal of the present invention, it is characterized in that, adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play, master alloy is iron-rare earth alloy, i.e. Fe-Ce alloy or Fe-Y alloy; Ce content in the Fe-Ce alloy is 23.5wt%, and the Y content in the Fe-Y alloy is 15wt%; Press above-mentioned raw materials prescription previously prepd master alloy, the consumption through each composition of Conversion Calculation is mixed with compound, is positioned over to carry out melting in the crucible, and last casting is made diphase stainless steel alloy material.
Through experimental study, and can replacement nickel and the action principle of rare earth in steel, find to stablize austenite in the dual phase steel, thereby do not use valuable nickel with proper amount of cheap manganese and nitrogen according to manganese and nitrogen; After in double phase stainless steel alloy, adding rare earth metal cerium or yttrium simultaneously, sulphur content in the alloy reduces greatly, or formed dystectic rare-earth sulfide disperse in matrix, avoid low melting point sulfide to be present on the phase boundary, thereby improved its high temperature thermoplasticity effectively.
High-nitrogen nickel-free super-duplex stainless steel alloy materials of the present invention has good solidity to corrosion, pitting ability high magnitude greater than 40; In 1000～1300 ℃, have hot workability preferably, and have the better physical mechanical property, so be a kind of super-duplex stainless steel alloy materials of high-nitrogen nickel-free cheaply with development prospect and potential use.
Embodiment
After now its body embodiment of the present invention being described in.
Embodiment 1
In the present embodiment, the composition and the weight percent thereof of diphase stainless steel alloy material are as follows:
Cr 25％
Mn 18％
Mo 3.5％
N 0.40％
C 0.01％
Rare-Earth Ce 0.105%
Si 0.8％
S 0.008％
P 0.01％
B 0.005％
The Fe surplus
Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play, i.e. the good master alloy of prepared beforehand.The alloy that consists of Fe and Ce of master alloy, the quality percentage composition of Ce is 23.5% in the Fe-Ce master alloy.Calculate and after batching founded, casting finally made high-nitrogen ultralow-nickel super-duplex stainless steel alloy materials through comprehensive metering, its pitting drag equivalent value is 42.95.
Embodiment 2
In the present embodiment, the composition and the weight percent thereof of diphase stainless steel alloy material are as follows:
Cr 25％
Mn 16％
Mo 3.5％
N 0.45％
C 0.01％
Rare Earth Y 0.105%
Si 0.6％
S 0.007％
P 0.01％
B 0.005％
The Fe surplus
Adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play.It is the good master alloy of prepared beforehand.The alloy that consists of Fe and Y of master alloy, the quality percentage composition of Y is 15% in the Fe-Y master alloy.Calculate and after batching founded, casting finally made the high nitrogen and low nickel duplex stainless steel alloy material through comprehensive metering, its pitting drag equivalent value is 43.75.
Learn that from above embodiment the pitting drag equivalent value of material is bigger than general dual phase steel.In addition, has hot workability preferably in 1000～1300 ℃ of this materials.
Claims (2)
1. high-nitrogen nickel-free super-duplex stainless steel alloy materials that contains rare earth metal is characterized in that the composition of this stainless steel alloy material and weight percent thereof are:
Cr 24～26％，
Mn 14～20％，
Mo 2.0～4.0％，
N 0.30～0.55％，
C 0.01～0.03％，
Rare-Earth Ce or Y 0.05～0.2%,
Si ≤ 1.0％，
S ≤ 0.01％，，
P ≤ 0.02％，
0＜B≤ 0.01％，
The Fe surplus.
2. the described a kind of preparation method who contains the high-nitrogen nickel-free super-duplex stainless steel alloy materials of rare earth metal of claim 1, it is characterized in that, adopt the conventional smelting process of tradition, when feeding intake, adopt pure iron seal of tube master alloy throw-in play, master alloy is iron-rare earth alloy, i.e. Fe-Ce alloy or Fe-Y alloy; Ce content in the Fe-Ce alloy is 23.5wt%, and the Y content in the Fe-Y alloy is 15wt%; Press above-mentioned raw materials prescription previously prepd master alloy, the consumption through each composition of Conversion Calculation is mixed with compound, is positioned over to carry out melting in the crucible, and last casting is made diphase stainless steel alloy material.
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| CN100457951C true CN100457951C (en) | 2009-02-04 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215675B (en) * | 2008-01-08 | 2010-06-30 | 上海大学 | Resource-saving diphase stainless steel alloy material and preparation method thereof |
| CN101215674B (en) * | 2008-01-08 | 2010-11-03 | 上海大学 | Economical diphase stainless steel alloy material and preparation method thereof |
| CN102383047A (en) * | 2011-10-31 | 2012-03-21 | 江苏亚盛金属制品有限公司 | High-nitrogen nickel-free super two-phase stainless steel |
| CN102888566B (en) * | 2012-11-06 | 2016-11-16 | 重庆材料研究院 | Medical high nitrogen and nickel-less austenitic stainless steel material and preparation method |
| CN103643144A (en) * | 2013-01-12 | 2014-03-19 | 上海大学 | Nickel-saving type super duplex stainless steel and preparation method thereof |
| CN103173687A (en) * | 2013-03-07 | 2013-06-26 | 上海大学 | Nickel-free economic double-phase stainless steel and its making method |
| CN103409703A (en) * | 2013-07-07 | 2013-11-27 | 兴化市特种不锈钢产业研究院 | Aluminum-containing high-manganese biphase stainless steel |
| CN104911495B (en) * | 2015-07-02 | 2016-09-07 | 句容恒达金属制品有限公司 | A kind of anti-rust metal pylon |
| CN105861955B (en) * | 2016-05-31 | 2018-01-19 | 上海大学兴化特种不锈钢研究院 | A kind of economical sulfur-bearing Cutting free austenitic stainless steel alloy material |
| CN105921755A (en) * | 2016-06-22 | 2016-09-07 | 依波精品（深圳）有限公司 | High-nitrogen nickel-free antibacterial stainless steel watch case and manufacturing method thereof |
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| CN1412337A (en) * | 2002-11-08 | 2003-04-23 | 陈才金 | Two-phase stainless steel |
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